S-PLUS Vs some other softwares

["Pravin" <jadhavpr@vcu.edu>]

Hi all,

(Almost)Always I have written S-PLUS code where for() loop looked indispensable to ME. Since it did my job at the expense of slightly more dos time, I never looked at the alternatives. But, this time I have a very simple problem and I thought for() loop should be able to do the job. But it didn't!

I am doing one permutation experiment that requires me to analyze data from 500,000 patients(9 samples per patient) and all I want to fit is the linear regression model and extract the estimates of slope on each patient. After running my computer for 16 hrs (CPU usage looked like it was computing all the time), S-PLUS reached patient number 19,000…...Is there any quicker way of doing this in S-PLUS? Or from what I always hear---- S-PLUS is limited by its ability to handle huge datasets at hand, do I have to look for some other software that can do this huge computational task really quickly? Any recommendations?

LOOP:
Nsub<-500,000
for (i in 1:nsub)  
        { od.fit<-lm(data.y~data.x,data="">
        slope[i,]<-coe(od.fit)[2}}
               
Thanks much,

Pravin

Pravin Jadhav